diff options
| author | alc <alc@FreeBSD.org> | 2005-04-08 05:15:55 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2005-04-08 05:15:55 +0000 |
| commit | 1ab7d22f97ea0829f4ecd7575ba5e8c1bea12bca (patch) | |
| tree | 1d60e90ccc86866f80d1d021c44ec1929f68e2aa /lib/libc/amd64/string/bcmp.S | |
| parent | 97c8eede3f4c672371fe59e16630fff65b27db34 (diff) | |
| download | FreeBSD-src-1ab7d22f97ea0829f4ecd7575ba5e8c1bea12bca.zip FreeBSD-src-1ab7d22f97ea0829f4ecd7575ba5e8c1bea12bca.tar.gz | |
Add machine-specific, optimized implementations of bcmp and memcmp.
PR: 73111
Submitted by: Ville-Pertti Keinonen <will@iki.fi> (taken from NetBSD)
MFC after: 3 weeks
Diffstat (limited to 'lib/libc/amd64/string/bcmp.S')
| -rw-r--r-- | lib/libc/amd64/string/bcmp.S | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/libc/amd64/string/bcmp.S b/lib/libc/amd64/string/bcmp.S new file mode 100644 index 0000000..bb72035 --- /dev/null +++ b/lib/libc/amd64/string/bcmp.S @@ -0,0 +1,25 @@ +#include <machine/asm.h> +__FBSDID("$FreeBSD$"); + +#if 0 + RCSID("$NetBSD: bcmp.S,v 1.1 2001/06/19 00:25:04 fvdl Exp $") +#endif + +ENTRY(bcmp) + xorl %eax,%eax /* clear return value */ + cld /* set compare direction forward */ + + movq %rdx,%rcx /* compare by words */ + shrq $3,%rcx + repe + cmpsq + jne L1 + + movq %rdx,%rcx /* compare remainder by bytes */ + andq $7,%rcx + repe + cmpsb + je L2 + +L1: incl %eax +L2: ret |
